Elevator governor



June 10, 1941. c; PANTER 2,244,893

ELEVATOR GOVERNOR Filed. Feb. 2, 1940 mix/59s.-

Patented June 10, 1941 QUNITED" STATES PATENT OFFlC E Carl Panter, Philadelphia, Pa., assignor to Atlantic Elevator Co., Inc., Philadelphia, Pa., a corporation of Pennsylvania r Application February 2, 1940, Serial No. 316,986 7 2 Qlaiins. (o1. 1ss-'1ss) An object of my invention is to provide a' governor for elevators and the like which is responsive to the speed of the elevator and-to any sudden acceleration in'that speed.

' More specifically, my invention comprises a rotatably mounted sheave over which passes the control cable of an elevator so that the sheave is rotated on its axis. This axis is in turn mounted on a support which is pivotally mounted and is supported in one direction about said pivot by means of springs. Dogs are provided adjacent the control cable passing over the sheave and mounted on said support and normally are latched out of engagement with the cable. One of these dogs has a portion aligned with a stationary bolt or other projection so that, when the control cable receives an extraordinary acceleration, as by the fall of the elevator car, the governor turns about its pivot against the stress of the springs and the pin causes the dogs to unlatch and come into engagement with its control cable and arrest its motion.

For a further exposition of my invention, reference may be had to the annexed drawing and specification at the end whereof my invention will be specifically pointed out and claimed.

In the drawing:

Fig. 1 is a top plan view of my device.

Fig. 2 is a side elevation of my device.

Fig. 3 is an end view of the adjacent parts of Fig. 2 with parts omitted for sake of clarity.

Fig. 4 is a plan view showing the mounting of the two dogs and operating lever with other parts omitted for sake of clarity.

In that embodiment of my invention selected from among others for illustration in the drawing and description in the specification, my device is shown as consisting of a sheave I mounted for rotation about an axis 9 which is carried by a stationary support 2. Support 2 is in turn pivotally mounted about a pivot or pin 3 and is supported at its opposite end from pivot 3 by spring 4. A control cable 5 passes over sheave I in a bight and is connected to the elevator by means not shown because well understood. These means include a cable connection which frees control cable 5 from the elevator car when the cable 5 is held fast and the elevator car is mov- Sheave I is also provided with a speed-responsive governor which is centrifugally operated and consists of the device generally indicated at I6 and the associated parts for operating dogs 'I. This speed-responsive governor is not shown in complete detail as it is well-known.

In general, the speed-responsive governor consists of two centrifugally-acting, speed-responsive elements consisting of toothed masses or weights I60 and I6I which are mounted on sheave "I for movement relative to each other and whichare stressed toward each other by-means of springs I62 and I63 which are held in a bridle I64, which is pivotally attached at its end to weight I60 and through which passes at the lower end rod' I65, which carries at its upper end a cross-piece I66 against which the stress of spring I62 'is received. Spring I63 stresses at one end against a stationary piece I61 fast on sheave I and, at its lower end, against the lower end of bridle I64. Carried by support 2 are two triggers a: and y. As will be seen, trigger a: is closer to the periphery of the weights I60 and I6I than is trigger y. Therefore, trigger a: is actuated by weight I60 or I6I before trigger y is.

Adjacent springs 4 and the free end of support 2, there is provided a stationary bolt 6 which is shown as adjustable in height by means of a screw-thread and lock-nuts. For a more minute adjustment, stationary bolt 6 is provided with a set-screw II] on the top end. Carried by support 2 and adjacent cable 5 are a pair of dogs I pivotally mounted on support 2 by means of journals or other pivots I2. The dogs I have interengaging teeth 'II thereon which are disposed to the right of the center line as seen in Figs. 3 and 4. The leader line from reference character 1 runs to a portion of each of the dogs which is on the center line of the cable and which serves as a cable-clamping member. That dog nearest pivot 3 carries a sloping portion I 4, while that dog I farthest from pivot 3 carries a projecting portion 16 aligned with bolt 6.

Also carried by support 2 and adjacent dogs I is a release latch lever I! pivoted at point I9 and extending beneath trigger y. Upon this release latch lever I'! a release latch I3 is mounted, pivoted at point 20. The release latch I3 has a sloping end pressing against a corresponding sloping portion I4 of dog 1 against which latch I 3 is stressed by a spring I5.

The operation of my device is as follows: In the normal operation of the elevator the control cable 5 passes around sheave I without operating either the speed-responsive governor I6 which is centrifugally operated or the acceleration-responsive governor consisting of the operating means for dogs I which is inertia-operated. However, assuming the right-hand reach of cable 5 as seen in Fig. 2 to be connected to the elevator car by some well-known means, such as a releasing carrier (not shown), and the car descending above its normal speed, the speedgovernor l6, due to centrifugal force, will engage trigger a: and trip the electric contact 2|. Should the car continue in its downward motion, the speed-governor will next engage trigger y, releasing pressure on release latch lever l1. With pressure released, spring l8 will force lever l1 upward, disengaging latch I 3 from portion M of dog 1 and thus release the two cable-gripping dogs, allowing them to fall and grip the cable.

The acceleration responsive governor will operate if the elevator icar suddenly accelerates the cable for any reason, such as the fall of the car, in which case, stress is applied to sheave l which causes sheave l to press support 2 against the stress of springs 4, thus causing dog I to move down on set screw I0. Latch I3 is thereby forced out of engagement with stationary catch I4 due to sloping end of this latch, causing dogs I to clamp cable 5 and hold it against further motion. This stoppage of cable 5 causes the releasing .carrier to break connection with the elevator car which, in turn, causes the well-known safety devices on the elevator car (which are not shown as they constitute no part of this invention) to be set to thereby arrest further movement of the elevator car. It will thus be seen that, since my governor is inertia-operated in response to the initial acceleration of the control cable 5, it is exceedingly quick in operation and thus stops the elevator car with a minimum of undesired movement.

I do not intend to be limited save as the scope of the attached claims may require.

I claim:

1. An acceleration-responsive inertia-operated governor for an elevator or the like comprising, a sheave, a control cable passing over said sheave, a support on which said sheave is mounted for rotation, a pivot mounting said support, springs stressing said support in one direction about said pivot, a stationary bolt mounted ad- 7 jacent the free end of said support, and dogs carried by said support adjacent said cable and arranged upon movement of said support about its pivot to be stressed by said bolt and to engage said cable. 7

2. An inertia-operated acceleration-responsive governor for elevators or the like comprising, a control cable, means for rotatably supporting a bight of said control cable, a support for said means, means forming a mounting for said support, dogs arranged for engagement with and disengagement from said control cable so that said dogs stop said control cable when in engagement therewith, and yielding means stressing said mounting against the pull of said control cable and arranged for yielding movement upon the application of an extraordinary acceleration to said control cable by the elevator car to cause engagement of said dogs with said cable.

CARL PANTER. 

